____ ____ ____ like ____ dog?
傅衣凌主编《中国历史·明史》载:从江南丝织业的整个生产过程看,一个机房中,机工有络工、拽工、织工、牵经工,还有刷边、运经、接头等工,各有专门技术……反映了明朝手工业( )
若直线l1:ax+(3﹣a)y+1=0,l2:2x﹣y=0,若l1⊥l2,则实数a的值为____
俄罗斯的平原有( )
I
Take a shower
My mother
Clean the kitchen
My father
Watch TV
My elder sister Alice
Work on the computer